diff --git a/plugin/eregex.vim b/plugin/eregex.vim
index 84c37ec..5fdcb11 100644
--- a/plugin/eregex.vim
+++ b/plugin/eregex.vim
@@ -742,10 +742,6 @@ function! s:Ematch(...)
         let offset = substitute(offset, '\C[' . s:str_modifiers . ']\+', "", "g")
     endif
 
-    if &ignorecase && match(modifiers, 'I') == -1
-      let modifiers .= 'i'
-    endif
-
     let regex = s:ExtendedRegex2VimRegex(regex, modifiers)
     "v130
     "set s:bakregex
@@ -806,9 +802,6 @@ function! s:Esubstitute(...) range
         let modifiers = substitute(options, '\C[^' . s:str_modifiers . ']\+', "", "g")
         let options = substitute(options, '\C[SCDmM]', "", "g")
     endif
-    if &ignorecase && match(modifiers, 'I') == -1
-      let modifiers .= 'i'
-    endif
 
     let regex = s:ExtendedRegex2VimRegex(regex, modifiers)
     "v130